A.O. Smith 28 30 50 60 service manual Electrical connection, Preparation Mains voltage

3

3.10Electrical connection

Installation is

Warning

The installation should be carried out by an approved installer in compliance with the general and local regulations imposed by the gas, water and power supply companies and the fire service.

Refer also to paragraph ’1.3 Regulations’.

3.10.1Introduction

Topics covered in this paragraph:

•3.10.2 Preparation;

•3.10.3 Mains voltage;

Optionally, it is possible to connect an isolating transformer, a continuous pump, a program-controlled pump, a “Tank ON” and an “Alarm OFF” to the appliance. For these options, see:

•3.10.4 Isolating Transformer;

•3.10.5 Continuous pump;

•3.10.6 program-controlled pump;

•3.10.7 Extra ON mode switch (“Tank ON”);

•3.10.8 Connecting extra error signal (“Alarm OUT”).

nRemark

The optional components are not included in the rating for electrical power consumption (see tables in paragraph 3.4).

3.10.2Preparation

c Note

The appliance is phase-sensitive. It is absolutely essential to connect the phase (L) from the mains to the phase of the appliance, and the neutral (N) of the mains to the neutral of the appliance.

There should also be no potential difference present between neutral (N) and earth (A). If this is the case, then an isolating transformer must be applied in the supply circuit. See ’3.10.4 Isolating Transformer’.

Figure 3.6 shows a view of the electrical connection block. Table 3.10 shows the associated connections.

Table 3.10 Electrical connection block

Unu

Tank on

Continuous

Regulated

Alarm Off

Isolating transformer

Mains power

sed

pump

pump

primary

secondary

X1

X2

A

L

N

N

L

A

X1

X2

A

N

L

A

N

L

A

N

L

A

1-4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

30 Instruction Manual BFC